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Beijing normal university printing plate junior two math problems
Because quadrilateral ABCD and quadrilateral BEFG are both squares.

Therefore, AG=EC extends the cross DC of GF to point n.

AGND is a kind of cancer.

FN=DN

In the triangle DFN

DN=FN angle DNF = 90°.

The DN of cognac is 1.

DF is the root number 2.

So AG ratio DF= 1 ratio root number 2.

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